Delete a credential by type

{
  "type": "object",
  "properties": {
    "accountname": {
      "type": "string"
    },
    "credential_type": {
      "type": "string",
      "enum": [
        "password"
      ]
    },
    "username": {
      "type": "string"
    }
  },
  "required": [
    "accountname",
    "credential_type",
    "username"
  ],
  "additionalProperties": false
}